Assets

Resistance thermometer connection

SITRANS TSinsert measuring inserts are, unless otherwise mentioned, designed as single Pt100 measuring inserts with 4-wire system. This makes it possible to implement all of the aforementioned connection types.

Double Pt100 measuring inserts (only possible with 6 mm outside diameter) are designed as 3-wire system.

Circuit diagrams 1 x Pt100-2W to 2 x Pt100-4W

Thermocouple connection

Circuit diagram for thermocouple

If thermocouples are used, the use of head transmitters offers particular advantages: The reference junction is already integrated in the universal transmitter. There is no need for expensive extension or compensating cables. This also removes a number of possible error sources. The weak millivolt signal of the thermocouple is already converted into a stable and temperature-linear DC or bus signal on site. This drastically reduces the effects of electromagnetic factors on the measurement result.

If a head transmitter is not installed, the sensor supply cable consists of the appropriate extension or compensating cable. The thermo line is made from the thermocouple material of the relevant thermocouple, while the compensating cable uses a cost-effective substitute material. The electrical behavior of the compensating cable is similar to that of the thermo line within a limited temperature range of up to 200 °C.

A wide spectrum of color coding exists for thermocouples on an international level. This must be taken into account during the connecting process.

¹⁾ For intrinsically safe cable as per IEC 584-3, the jacket is always blue.

²⁾ With thermo lines as per ANSI MC96, the jacket is always blue.

Plug connectors

In some cases, sensors are not connected directly but with plug connectors. The connection is made according to the figures below.

Lemo 1S coupling (SITRANS TS100/TS200)

M12 connector for single sensors (SITRANS TS100/TS200/TS500)

M12 connector for single sensors (SITRANS TS300)

M12 connector for dual sensors (SITRANS TS100)

HAN7 D connector (SITRANS TS500)

Transmitter connection

If SITRANS TH transmitters are used in the connection head of the temperature sensor, connection takes place according to the following pattern:

SITRANS TH100/TH200/TH300

Resistance thermometer

Thermocouples

SITRANS TH400

SITRANS TS500 TH transmitter display

In addition, our transmitters also allow for a large number of other possible connections (e.g. difference, average, 2 sensors). More information can be obtained at:

http://www.siemens.com/temperature